R help - Jan 2011 - grofit package

Dear All,

 
I want to use grofit package for biological growth curves.  My dataset only
includes "age" variable and "size" variable. I want to use
logistic, gompertz and richards growth curves to predict age from size. How can
I implement this data set to the function in grofit package?
 
Best regards,
Deniz 		 	   		  
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